Hmm... probably bias here, but I would put True Tear above Iroha in my opinion. The artistic direction, visuals and technical merits were astounding in that one. Just a crying shame it didn't get to sell more.
And because some people will probably misconstrue what I said, Iroha is fantastic too. I just prefer True Tears, and no amount of brow-beating will make you make me change my opinion on the matter.
Cheers.